Self-contained free floating window or door actuated burglar alarm for wood or steel casements therefor



N. .1. ABATE 2,752,876 CONTAINED FREE FLOATING WINDOW OR DOOR ACTUATED BURGLAR ALARM FOR WOOD OR STEEL CASEMENTS THEREFOR 2 Sheets-Sheet l 6m m 55 9 9 1 m 3 A J m ATToRNEm July 3, 1956 N. J. ABATE 2,752,876

SELF-CONTAINED FREE FLOATING wmnow 0R DOOR ACTUATED BURGLAR ALARM FOR W000 012 STEEL CASEMEINTS THEREFOR Filed Aug. 9, 1955 2 Sheets-Sheet 2 IN VEN TOR JAB/1T5 SELF-CONTAINED FREE FLOATING WINDOW OR DOOR ACTUATED BURGLAR ALARM FOR WOOD OR STEEL CASEMENTS THEREFOR Nicholas John Abate, Baltimore, Md., assignor of onehalf to William F. Chew, Garrison, Md.

Application August 9, 1955, Serial No. 527,201

3 Claims. (Cl. 116-16) The present invention relates to self contained free floating window or door actuated burglar alarm for wood or steel easements therefor and has for an object to provide a mechanical alarm, compact in size, light in weight and foolproof in operation.

Another object of the present invention is to provide a mechanical alarm detect relative movement between two surfaces such as window and window frame, door and door jamb, drawers and supports therefor etc. which once set in motion cannot be stopped by that agency setting it in operation by sneaking it back to the origin position quickly.

A further object of the present invention is to provide a device of the character described which may be rendered inoperative in position when desired without necessitating its removal.

A still further object of the invention is to provide an alarm self contained which although being small and compact will provide sutlicient noise to attract attention to its actuations.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views:

Figure l is an exploded perspective view of a device constructed in accordance with the present invention.

Figure 2 is an assembled perspective view of the device of Figure 1.

Figure 3 is a side elevational view of the device of Figure 1 in the set position with the end cover removed and parts broken away.

Figure 4 is a view similar to Figure 3 in the tripped condition with parts broken away.

Figure 5 is fragmentary perspective view with parts broken away and parts shown in section of the clapper release mechanism.

Figure 6 is a side elevational view of the unit of Figure 2 shown applied to a window.

Figure 7 is a top plan view of the toggle lock linkage triggering mechanism in the set position.

Figure 8 is a view similar to Figure 7 but in the right tripped position.

Figure 9 is a view similar to Figure 7 but in the left tripped position.

Figure 10 is a view similar to Figure 7 but in the retracted or inoperative condition.

Figure l 1 an edge view of a unit constructed in accordance with the present invention.

Fi ure 12 is a side elevational view of the unit of Figures 7 through 11.

Referring to the drawings in which but a single form of the invention is illustrated and for the movement to Figure 1, 2t) designates generally the mechanism support section which is enclosed by an end cover 21 and alarm bell 22. A Winding disc 23 is provided externally of the unit.

nited States Patent 0 l ice Referring next to Figures 11 and 12 the mechanism support will be described which may comprise three spaced discs 24, 25 and 26 maintained in spaced relation by spacer rods 27 and 28. Between discs 24 and 25 is housed the conventional spring motor 29 with its winding stem 30 extending through the disc 24. The output of the spring motor 29 drives a reduction gearing and escapement mechanism which is housed in the area be tween discs 25 and 26. The spring motor and reduction gearing are conventional mechanism known in this art and will not be described in detail.

Referring now to Figures 7 through 10 inclusive the triggering mechanism may comprise a primary lever 32 having a longitudinal slot 33 therein. At one end of the lever 32 is a knurled or otherwise roughened head 35. The lever 32 is made captive with the disc 26 by a pivot 36 which permits the lever to rotate about the pivot and to be slid forward and backward, the pivot 36 riding in the longitudinal slot 33. The other end of lever 32 is pivotally connected to one end of a secondary lever 37 at 38. This secondary lever 37 also has a longitudinal slot 39 therethrough which accommodates a pivot til journaled in disc 26 at its base and in a bridge 41 at its top. The bridge 41 is maintained above disc 26 by spacers 42 to permit this secondary lever 37 to also rotate and slide about the pivot 40. A point 43 is provided at the free end of the lever 37 to engage one of the surfaces to be protected. Upstanding from the pivot 41 and the lever 32 are projections 44, 45 to which are connected the ends of a toggle locking spring 46.

Referring now to Figures 5 and 12, the pivot 40 carries secured for rotation therewith a stop projection 47 positioned to engage the bell clapper 31. Secured to pivot 4% above disc 26 is a control boss 48 having flat sides 49 and being snugly received within the slot 39 in lever 37 whereby upon rotation of lever 37 about pivot 40 the stop projection 47 will be moved into or out of engagement with the bell clapper, as shown in Figures 3 and 4.

The end cover 21 comprises a disc Sil having an upstanding flange 51 and a cutaway 52 to accommodate the pointed end of lever 37. Secured to the base of cover 22 is a mounting bracket 53 having a down turned flange 54 with screw receiving openings 55 therethrough.

The bell 22 is constructed of a metal having a good tonal quality and being capable of emitting a signal audible for a distance of ft. or more. This bell 22 is the fiat type having a flange 56 and end disc 57, having an opening 58 therethrough to accommodate the winding stem 34 of the spring motor. The units are assembled and retained in operative relationship by screws 5?.

In operation When it is desired to detect the relative movement between two surfaces such as the window sash frames 60, 61 of Figure 6, the unit is set in place: as shown and retained by wood screws 62.

The position of the levers when setting the device should be that of Figure 10 with the handle 34 and head 35 rotated to retain the levers in an aligned condition in which the boss 48 strikes the end of the slot 39 in the secondary lever 37. This will cause the stop projection 47 to engage the bell clapper 31 and restrain it from operation. The spring 46 will be distended in this position.

When the window is closed and it is desired to set the alarm the head 35 is rotated and released causing the parts to occupy the positions of Figure 7. The pointed end 43 of the secondary lever 37 under the loading of spring 46 is brought into pricking contact with the other surface and partially enters the surface. Upon an in truder attempting to raise the window from the bottom the unit parts will assume the position of Figure 8 in which the secondary lever 37 has been pivoted out of alignment with lever 32 causing the boss 48 to rotate the pivot 40 and stop projection 47 has been removed from engagement with the bell clapper 31 permitting the spring motor 29 to drive the gearing and bell clapper 31 to sound the bell 22 giving the alarm.

As soon as the lever 37 moves from the aligned position with lever 32 the spring 46 accelerates the toggle lock of the two levers making it impossible for the intruder to return the window to the origin position and thereby stop the bell.

Comparing Figures 7 and 8 it will be noted that in Figure 7, the set position, the point 41 of lever 37 extends a good distance beyond the disc 26 and bell flange 56, but when tripped as shown in Figure 8 the point is almost within the confines of disc 26. In fact the point 41 has left contact with the surface it originally penetrated and no amount of juggling of the window up or down by the intruder will stop the alarm.

The alarm unit may be constructed of any suitable light weight metal or appropriate substitute therefor which will give the desired end result of an audible, durable, compact, inexpensive alarm.

While I have shown but one form of the invention I reserve unto myself all modifications falling within the scope of the appended claims.

What I claim is:

1. For use with two relatively movable surfaces the movement of one of which is to be detected, a mechanical alarm device comprising a support adapted to be mounted 30 to one of said surfaces, an alarm bell on said support, a spring motor driving a clapper mechanism positioned on said support with the clapper in position to sound the bell, a first lever having a slot therethrough and being pivoted to said support through said slot, a second lever having a slot therethrough and being pivoted to said support through its slot, said second lever having a pointed end adapted to engage one of said surfaces and being pivoted to said first lever at its other end, and clapper immobilizing means operatively associated with the pivot in the slot of said second lever and said clapper whereby upon movement of one of said surfaces the second lever will disengage the clapper immobilizing means permitting the sounding of the bell and throw the first and second lever into a toggle lock whereby the moved surface cannot be restored to its original position to stop the sounding of the bell.

2. A mechanical alarm device as claimed in claim 1 further comprising spring means for retaining the first and second levers in a toggle lock position when the point of said second lever has been shifted to either side of its center.

3. A mechanical alarm device as claimed in claim 1 further comprising means associated with the free end of said first lever and said support for withdrawing the pointed end of said second lever from contact with the surface the movement of which is to be detected without sounding the bell.

Head Dec. 23, 1913 Vinz Apr. 1, 1941 

